dear rails: all your validation functionality is in completely the wrong place
Things like uniqueness and foreign key integrity always makes that line blurry as well though
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or, validating a msg vs a failure in executing it -- uniqueness violations often mean "the effect of this message cannot be executed"
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No difference for the end user. (This is assuming the uniqueness validation is actionable by the user, which is rare)
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a useful distinction here: validating a single record vs validating a collection
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